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Constraining the dark-energy equation of state with cosmological data
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abstract
Recently, the observed equation of state for dark energy appears to favor values below $-1$. The tendency implies that the nature of dark energy may be quite different from that of the cosmological constant. In view of the adjustment on the equation of state keeps decreasing, the introduction of the phantom energy seems inevitable. By employing observational constraints from supernovae and from the acoustic scale in which the accuracy of the data has become extraordinary, we apply a phenomenological scenario to be acquainted with the evolution of our universe. The demonstration on the constrained unfolding of the phantom energy shows the model has high consistency with the current observation.
Forward citations
Cited by 2 Pith papers
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General parametrization for energy density of quintessence field
A step-like parametrization of quintessence energy density reproduces all three known dark energy dynamics across redshifts, but cosmological data still prefer ΛCDM except in the CPL model.
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Exploring cosmological imprints of phantom crossing with dynamical dark energy in Horndeski gravity
A Horndeski scalar-field dark energy model that crosses the phantom divide and has negative early-time energy density fits cosmological data as well as LambdaCDM but does not resolve the main tensions.
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